Ovariectomy effect in heifers Nelore x Angus, Bos taurus indicus x Bos taurus taurus on the weight gains

Authors

  • Marcelo George Mungai Chacur Universidade do Oeste Paulista
  • Maurício de Faria Marin Universidade do Oeste Paulista
  • Eunice Oba Universidade Estadual Paulista
  • Sérgio do Nascimento Kronka Universidade do Oeste Paulista

DOI:

https://doi.org/10.5433/1679-0359.2007v28n2p317

Keywords:

Beef cattle, castration, pasture, confinement

Abstract

This study aimed to evaluate the weight gain in cross breed heifers Nelore X Angus, spayed and nonspayed, kept on pasture and confinement. The animals were allotted in two groups as follows: group 1 consisted of 30 nonspayed heifers with 18 months old. Group 2 was composed of 30 spayed heifers with 18 months old. The animals were allotted in pasture of Brachiaria decumbens and weighted at 39 and 75 days. Significant difference was observed between the average daily gain of the two groups – G1 and G2 (75th day), respectively (0.51 kg and 0.65 kg; P < 0.01). The following day (76th day), all animals were allotted and kept on confinement during 144 days. Significant difference was observed between the average daily gain of the two groups – G1 and G2 (144th day), respectively (0.73 kg and 0.58 kg; P < 0.01). The results of this experiment show that spayed heifers presented a higher daily gain on pasture.

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Author Biographies

Marcelo George Mungai Chacur, Universidade do Oeste Paulista

 

Médico Veterinário – Prof. Dr. Universidade do Oeste Paulista – UNOESTE, Faculdade de Ciências Agrárias – FCA, Depto. Reprodução Animal.

Maurício de Faria Marin, Universidade do Oeste Paulista

 

Acadêmico de Medicina Veterinária – Iniciação Científica, UNOESTE

Eunice Oba, Universidade Estadual Paulista

Médica Veterinária – Profa. Dra. Universidade Estadual Paulista – UNESP, Botucatu-SP

Sérgio do Nascimento Kronka, Universidade do Oeste Paulista

Engenheiro Agrônomo – Prof. Dr. Universidade do Oeste Paulista – UNOESTE

Published

2007-10-30

How to Cite

Chacur, M. G. M., Marin, M. de F., Oba, E., & Kronka, S. do N. (2007). Ovariectomy effect in heifers Nelore x Angus, Bos taurus indicus x Bos taurus taurus on the weight gains. Semina: Ciências Agrárias, 28(2), 317–322. https://doi.org/10.5433/1679-0359.2007v28n2p317

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